linux-kernel - Re: [PATCH] arm: Don't use memblock limit for the lowmem bound

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Date:	Thu, 14 May 2015 11:14:47 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Laura Abbott <labbott@...oraproject.org>
Cc:	Mark Rutland <mark.rutland@....com>, Arnd Bergmann <arnd@...db.de>,
	Nicolas Pitre <nico@...aro.org>,
	Stefan Agner <stefan@...er.ch>,
	Laura Abbott <labbott@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH] arm: Don't use memblock limit for the lowmem bound

On Mon, May 11, 2015 at 07:53:41PM -0700, Laura Abbott wrote:
> From: Laura Abbott <labbott@...hat.com>
> 
> The memblock limit is currently used in find_limits
> to find the bounds for ZONE_NORMAL. The memblock
> limit may need to be rounded down a PMD size to ensure
> allocations are fully mapped though. This has the side
> effect of reducing the amount of memory in ZONE_NORMAL.
> Since we generally want to optimize for more lowmem, fix
> this by using arm_lowmem_limit to calculate the bounds.
> This what is used for actually mapping lowmem anyway.
> 
> Before:
> # cat /proc/zoneinfo | grep managed
>         managed  62920
> 
> After:
> # cat /proc/zoneinfo | grep managed
>         managed  63336
> 
> 
> 
> Signed-off-by: Laura Abbott <labbott@...hat.com>

Ok.  -> patch system please.

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